Elderberry has more red and on a thicker stem. It initially looks kind of alien and rubbery. It also doesn't spread much that I remember. It just grows in thickets if you let it establish and reseed. itself.
Sumac grows into a drift in a season or two because the roots spread quickly and new plants grow from the roots. It also adapts to many conditions and is native in all the lower 48 states. (Or if not native, already widely established when anyone got around to checking.). To really get rid of it you need to dig out all the roots, which aren't bigger than the plant stem but are shallow and numerous.
Maybe you have sumac too. :-)
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